Matematika

Pertanyaan

a. y + 2x + 2 = 0
b. y - 2x - 1 = 0
c. y + 2x - 2 = 0
d. y - 2x + 1 = 0
a. y + 2x + 2 = 0 b. y - 2x - 1 = 0 c. y + 2x - 2 = 0 d. y - 2x + 1 = 0

1 Jawaban

  • x1 = -2
    y1 = -3
    x2 = 4
    y2 = 9

    Persamaan garisnya,

    (y - y1)/(y2 - y1) = (x - x1)/(x2 - x1)
        (y + 3)/(9 + 3) = (x + 2)/(4 + 2)
              (y + 3)/12  = (x + 2)/6                |Kali silang|
               12 (x + 2) = 6 (y + 3)
               12x + 24  = 6y + 18
                 12x - 6y = 18 - 24
           12x - 6y + 6 = 0    |:6|
               2x - y + 1 = 0
             -y + 2x + 1 = 0   |x-1|
                y - 2x - 1 = 0  (B)


    Semoga Membantu!!!